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Recovery of boron from unacidified salt lake brine by solvent extraction with 2,2,4-trimethyl-1,3-pentanediol
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  • Xiaowu Peng,
  • Dong Shi,
  • Yuze Zhang,
  • Licheng Zhang,
  • Lianmin Ji,
  • Lijuan Li
Xiaowu Peng
Qinghai Institute of Salt Lakes Chinese Academy of Sciences
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Dong Shi
Qinghai Institute of Salt Lakes Chinese Academy of Sciences
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Yuze Zhang
Qinghai Institute of Salt Lakes Chinese Academy of Sciences
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Licheng Zhang
Qinghai Institute of Salt Lakes Chinese Academy of Sciences
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Lianmin Ji
Qinghai Institute of Salt Lakes Chinese Academy of Sciences
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Lijuan Li
Qinghai Institute of Salt Lakes Chinese Academy of Sciences
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Abstract

The recovery of boron from salt lake brine using 2,2,4-trimethyl-1,3-pentanediol was investigated. Factors affecting boron recovery, including pH, concentrations of extractant and H3BO3, phase ratio(O/A), and temperature, were investigated. Increasing pH initially resulted in high extraction rate, but there was a limitation, as further increasing pH resulted in rapid formation of B[OH]4- having a low capacity to complex with TMPD, and therefore lower boron extraction. Boron recovery increased as the TMPD and O/A increased. The combination of pH <7, O/A=1 & n(TMPD/H3BO3)=2:1 was ideal for boron recovery, resulting in extraction efficiency of >85%. To investigate extraction mechanism, slope ratio method was combined with Raman and infrared spectroscopy to characterize the structure of complex. Furthermore, under optimal conditions, a three-stage extraction and two-stage stripping process was performed, resulting extraction and stripping efficiency were 97.12% and 88.98%, respectively. The results reveal a promising strategy of boron recovery from SL brine without acidification.